Add note on inherited settings to docs

Author: aweebit

Readme.md

@@ -546,6 +546,8 @@ subcommand is specified ([example](./examples/defaultCommand.js)).
 
 You can add alternative names for a command with `.alias()`. ([example](./examples/alias.js))
 
+Commands added with `.command()` automatically inherit settings for which inheritance is meaningful from the parent command, but only upon the subcommand creation. The setting changes made after calling `.command()` are not inherited.
+
 For safety, `.addCommand()` does not automatically copy the inherited settings from the parent command. There is a helper routine `.copyInheritedSettings()` for copying the settings when they are wanted.
 
 ### Command-arguments